Mixed Cartesian Feedback for Zero-IF WCDMA Transmitter

Mohamed Abid (1, 2) , Nicolas Delaunay (2, 3) , Bertrand Le Gal (2) , Dominique Dallet (2) , Chiheb Rebai (4) , Nathalie Deltimple (2) , Eric Kerherve (2) , Didier Belot (3)

1 SUP'COM [TUNIS] - Ecole supérieure des communications de Tunis
2 IMS - Laboratoire de l'intégration, du matériau au système
3 ST-CROLLES - STMicroelectronics [Crolles]
4 SUP'COM

In this paper, a new adaptive power amplifier (PA) linearization technique is presented. The idea is to consider a classic WCDMA Zero-Intermediate Frequency (Zero-IF) transmitter with a modified Cartesian feedback (CFB) loop. The new transmitter architecture consists of an analog stage including forward I/Q modulator and feedback I/Q demodulator and a digital stage adjusting the phase rotation around the loop. The digital phase-alignment system consumes 2.94 mW (tree time less than a full-analog system).

Domaines: Electronique

Mohamed Abid, Nicolas Delaunay, Bertrand Le Gal, Dominique Dallet, Chiheb Rebai, et al.. Mixed Cartesian Feedback for Zero-IF WCDMA Transmitter. LASCAS 2011, Feb 2011, Bogota, Colombia. pp.1, ⟨10.1109/LASCAS.2011.5750300⟩. ⟨hal-00586824⟩